Electrophotographic imaging with toners of opposite sign electri

Details Electrophotographic imaging with toners of opposite sign electri Electrophotographic imaging with toners of opposite sign electri

1994-02-15

1995-09-12

Moses, R. L.

Photocopying

Contact printing

Light boxes

355245, 430 35, 430 44, G03G 1501

Patent

active

054501890

ABSTRACT:
A system and method for electrophotographic printing an image with a plurality of toners, where the plurality of toners includes toners that are attracted to either a first charge potential or a second charge potential. The electrophotographic system includes a photoconductive surface that is charged to the second charge potential. A laser selectively discharges the photoconductive surface to the first charge potential in accordance the image to be printed. Those toners that are attracted to the first charge potential are applied to the photoconductive surface, wherein the toners are electrostatically attracted to those areas of the photoconductive surface that are at the first charge potential. The photoconductive surface again charged to the second charge potential. The photoconductive surface is again discharged to the first charge potential in accordance with those areas of the image to which those toners that are attracted to the second charge potential are to be repelled. Those toners that are attracted to the second charge potential are applied to the photoconductive surface, wherein the toners are electrostatically attracted to those areas of the photoconductive surface that remain at the first charge potential. Finally, the image is transferred to a receiving surface.

REFERENCES:
patent: 5155541 (1992-10-01), Loce et al.
patent: 5194351 (1993-03-01), Roller
patent: 5241358 (1993-08-01), Germain et al.
patent: 5241359 (1993-08-01), Williams

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